Hard drive expansion expert needed! - recommendations?

Hello-
I have a Powermac Dual 450 with a 120Gb Seagate drive and the original 40 (30?) Gb drive. I would like to add a second larger drive to create a mirrored backup using CCC or Superduper!. I see a few options, and ask you all what is the best choice:
1. Pull the 40GB drive and add another 120GB - the 40 is rarely used, and data could be transfererd to a 2.5 external drive.
2. Pull the 40GB and add a 200GB drive (which is now CHEAPER than the 120 at Circuit City - $50 vs ~$100), knowing that only 120 will be recognized - does this affect performance? Will the drive revert to 200GB in a newer machine in a few years?
3. Can I add a 3rd drive to this system, keeping the current 120 and 40??? Not sure from what I have read on line.
4. Go with an external enclosure - do I have to max at 120GB with this, or can I go higher? Since the internal is 120, I don't really need much more. Any advantage to the external over internal - speed? Seems a bit more $$. Easier for someone to walk off with the external than the whole computer too!
Enclosure recommendations?
5. Something else I haven't considered?
Right now I am leaning towards #2 as it is a $50 solution, but wonder about #4.
THANK YOU!

Hello,
when you sleep the computer the external should go to sleep , i got a problem though on my powerbook G3 233Mhz and the external sometimes stop the comp starting after a long sleep so i have to restart, but i haven't tried yet with the G4, so far i don't remember having problems with my Imac G3, i think it depends .
But when you shut down the comp then switch the external off but don't forget to start it up first before starting the comp back as the desktop still got the ex on it!!!
When you want to shut or unplug the ex you always heve to eject it first to get it off the desktop and save your data from moss.
if you set the computer to back up your data (eg.index) the comp should wake and start the script!!!
As far as speed with external or internal is a simple fact. Internal goes faster, but with a good processor it doesn't show much the difference to your eyes, it's stay at a good rate for the ex, the ext as the advantage to be able staying away from troubles . I mean you can always plug it in on another comp and use your datas rather than the inter might have more hardware troubles since it is plug straight onto the motherboard and else!!! it's always better to have an external to keep your data safe and back them up so clean ones are more likely to be on the ext than the inter in case of hardware problems or damages.
Get one that 's all I can advise you. Also i use Techtool Pro which help me keeping my data safe.
regards

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